cstorey/index.html

## index.html
<html>
    <head>
        <script src="out/goog/base.js" type="text/javascript"></script>
        <script src="hello_world.js" type="text/javascript"></script>
        <script type="text/javascript">goog.require("hello_world.core");</script>
    </head>
    <body>
    </body>
    <script type="text/javascript">hello_world.core.run()</script>
</html>

## project.clj
(defproject hello-world "0.1.0-SNAPSHOT"
  :description "FIXME: write this!"
  :url "http://example.com/FIXME"

  :dependencies [[org.clojure/clojure "1.5.1"]
                 [org.clojure/clojurescript "0.0-2173"]
		 [reagent "0.4.1"]
		 [org.clojure/core.async "0.1.267.0-0d7780-alpha"]
		 [org.clojure/core.match "0.2.1"]]

  :plugins [[lein-cljsbuild "1.0.2"]]

  :source-paths ["src"]

  :cljsbuild {
    :builds [{:id "hello-world"
              :source-paths ["src"]
              :compiler {
                :preamble ["reagent/react.js"]
                :output-to "hello_world.js"
                :output-dir "out"
                :optimizations :whitespace
                :source-map "hello_world.js.map"}}]})

## src_hello_world_core.cljs
; Actual path: src/hello_world/core.cljs
(ns hello-world.core
  (:require [reagent.core :as reagent :refer [atom]]
            [cljs.core.async :as async
             :refer [<! >! chan close! sliding-buffer put! alts!]]
            [cljs.core.match])
  (:require-macros [cljs.core.async.macros :refer [go go-loop]]
                   [cljs.core.match.macros :refer [match]]))

(enable-console-print!)

(defn controller [inchan state-ref]
  (go-loop [cur-x nil cur-y nil mouse-state :up]
    (match [(<! inchan) mouse-state]
           [({:type "mousedown" :x x :y y} :as e) :up]
           (do
             (recur x y :down))

           [({:type "mousemove" :x x :y y} :as e) :down]
           (do
             (swap! state-ref update-in [:current-path] conj {:x x :y y})
             (recur x y :down))

           [({:type "mouseup" :x x :y y} :as e) :down]
           (do
             (swap! state-ref (fn [{:keys [current-path paths] :as state}]
                                (assoc state :paths (conj paths current-path) :current-path [])))
             (recur x y :up))

           [s e] (recur cur-x cur-y mouse-state))))

(defn path-component [path fill-color]
  (let [xys (map (fn [{:keys [x y]}] (str x " " y)) path)
        points (apply str (interpose ", " xys))]
    [:polyline {:points points :stroke fill-color :fill "none"}]))

(defn event-handler-fn [comms component e]
  (let [bounds (. (reagent/dom-node component) getBoundingClientRect)
        x (- (.-pageX e) (.-top bounds))
        y (- (.-pageY e) (.-left bounds))]
     (put! comms {:type (.-type e) :x x :y y})))

(defn hello-world-app [{:keys [state-ref comms] :as props}]
  (let [{:keys [paths current-path]} @state-ref
        component (reagent/current-component)
        handler-fn (partial event-handler-fn comms component)]
    [:svg {:height 480 :width 640
           :on-mouse-up handler-fn :on-mouse-down handler-fn :on-mouse-move handler-fn
           :style {:border "thin solid black"}}
     (cons [path-component current-path "red"]
      (map #(vector path-component % "black") paths))]))

(defn ^:export run []
  (let [paths-atom (atom {:paths []})
        ch (chan)
        proc (controller ch paths-atom)]
    (reagent/render-component
     [hello-world-app {:state-ref paths-atom :comms ch}]
     (.-body js/document))
    (go
      (let [exit (<! proc)]
        (prn :exit! exit)))))
	<html>
	<head>
	<script src="out/goog/base.js" type="text/javascript"></script>
	<script src="hello_world.js" type="text/javascript"></script>
	<script type="text/javascript">goog.require("hello_world.core");</script>
	</head>
	<body>
	</body>
	<script type="text/javascript">hello_world.core.run()</script>
	</html>
	(defproject hello-world "0.1.0-SNAPSHOT"
	:description "FIXME: write this!"
	:url "http://example.com/FIXME"

	:dependencies [[org.clojure/clojure "1.5.1"]
	[org.clojure/clojurescript "0.0-2173"]
	[reagent "0.4.1"]
	[org.clojure/core.async "0.1.267.0-0d7780-alpha"]
	[org.clojure/core.match "0.2.1"]]

	:plugins [[lein-cljsbuild "1.0.2"]]

	:source-paths ["src"]

	:cljsbuild {
	:builds [{:id "hello-world"
	:source-paths ["src"]
	:compiler {
	:preamble ["reagent/react.js"]
	:output-to "hello_world.js"
	:output-dir "out"
	:optimizations :whitespace
	:source-map "hello_world.js.map"}}]})
	; Actual path: src/hello_world/core.cljs
	(ns hello-world.core
	(:require [reagent.core :as reagent :refer [atom]]
	[cljs.core.async :as async
	:refer [<! >! chan close! sliding-buffer put! alts!]]
	[cljs.core.match])
	(:require-macros [cljs.core.async.macros :refer [go go-loop]]
	[cljs.core.match.macros :refer [match]]))

	(enable-console-print!)

	(defn controller [inchan state-ref]
	(go-loop [cur-x nil cur-y nil mouse-state :up]
	(match [(<! inchan) mouse-state]
	[({:type "mousedown" :x x :y y} :as e) :up]
	(do
	(recur x y :down))

	[({:type "mousemove" :x x :y y} :as e) :down]
	(do
	(swap! state-ref update-in [:current-path] conj {:x x :y y})
	(recur x y :down))

	[({:type "mouseup" :x x :y y} :as e) :down]
	(do
	(swap! state-ref (fn [{:keys [current-path paths] :as state}]
	(assoc state :paths (conj paths current-path) :current-path [])))
	(recur x y :up))

	[s e] (recur cur-x cur-y mouse-state))))

	(defn path-component [path fill-color]
	(let [xys (map (fn [{:keys [x y]}] (str x " " y)) path)
	points (apply str (interpose ", " xys))]
	[:polyline {:points points :stroke fill-color :fill "none"}]))

	(defn event-handler-fn [comms component e]
	(let [bounds (. (reagent/dom-node component) getBoundingClientRect)
	x (- (.-pageX e) (.-top bounds))
	y (- (.-pageY e) (.-left bounds))]
	(put! comms {:type (.-type e) :x x :y y})))

	(defn hello-world-app [{:keys [state-ref comms] :as props}]
	(let [{:keys [paths current-path]} @state-ref
	component (reagent/current-component)
	handler-fn (partial event-handler-fn comms component)]
	[:svg {:height 480 :width 640
	:on-mouse-up handler-fn :on-mouse-down handler-fn :on-mouse-move handler-fn
	:style {:border "thin solid black"}}
	(cons [path-component current-path "red"]
	(map #(vector path-component % "black") paths))]))

	(defn ^:export run []
	(let [paths-atom (atom {:paths []})
	ch (chan)
	proc (controller ch paths-atom)]
	(reagent/render-component
	[hello-world-app {:state-ref paths-atom :comms ch}]
	(.-body js/document))
	(go
	(let [exit (<! proc)]
	(prn :exit! exit)))))